You can download Barbara Hambly's The Silent Tower, first volume in the Windrose Chronicles, for only 2.99$ here.

Here's the blurb:

A wizard and a computer programmer from opposite sides of an interdimensional portal must work together to save their worlds from destruction.In a world where wizards are relegated to ghettos, it is no surprise to see one murdered in the street. But for Stonne Caris, a young warrior monk who sees the killing and gives chase to the culprit, there is nothing ordinary about seeing a murderer disappear into a black, inky portal. The Archmage sends him in search of Antryg Windrose—a half-mad mage who understands the nature of these passages between dimensions.On the other side of the Void is Joanna, a programmer as mild as Caris is deadly. She has spent her life in cubicles, staring into computer terminals, as far from heroism as she can get. But when the power that is crossing between dimensions draws her through the Void, she finds herself battling to save a world she never even knew existed.This ebook features an illustrated biography of Barbara Hambly, including rare photos and never-before-seen documents from the author’s personal collection.

You can also get your hands on Nalo Hopkinson's Sister Mine for only 2.99$ here.

Here's the blurb:

WINNER OF THE 2013 ANDRE NORTON NEBULA AWARDNalo Hopkinson--winner of the John W. Campbell Award, the Sunburst Award, and the World Fantasy award (among others), and lauded as one of our "most inventive and brilliant writers" (New York Post)--returns with a new work. With her singular voice and characteristic sharp insight, she explores the relationship between two sisters in this richly textured and deeply moving novel . . .SISTER MINEWe'd had to be cut free of our mother's womb. She'd never have been able to push the two-headed sport that was me and Abby out the usual way. Abby and I were fused, you see. Conjoined twins. Abby's head, torso, and left arm protruded from my chest. But here's the real kicker; Abby had the magic, I didn't. Far as the Family was concerned, Abby was one of them, though cursed, as I was, with the tragic flaw of mortality.Now adults, Makeda and Abby still share their childhood home. The surgery to separate the two girls gave Abby a permanent limp, but left Makeda with what feels like an even worse deformity: no mojo. The daughters of a celestial demigod and a human woman, Makeda and Abby were raised by their magical father, the god of growing things--a highly unusual childhood that made them extremely close. Ever since Abby's magical talent began to develop, though, in the form of an unearthly singing voice, the sisters have become increasingly distant.Today, Makeda has decided it's high time to move out and make her own life among the other nonmagical, claypicken humans--after all, she's one of them. In Cheerful Rest, a run-down warehouse space, Makeda finds exactly what she's been looking for: an opportunity to live apart from Abby and begin building her own independent life. There's even a resident band, led by the charismatic (and attractive) building superintendent.But when her father goes missing, Makeda will have to discover her own talent--and reconcile with Abby--if she's to have a hope of saving him . . .

Finally, Hopkinson's Brown Girl in the Ring is available for the same price here.

Here's the blurb:

The rich and privileged have fled the city, barricaded it behind roadblocks, and left it to crumble. The inner city has had to rediscover old ways-farming, barter, herb lore. But now the monied need a harvest of bodies, and so they prey upon the helpless of the streets. With nowhere to turn, a young woman must open herself to ancient truths, eternal powers, and the tragic mystery surrounding her mother and grandmother.She must bargain with gods, and give birth to new legends.